Optimizing virtual storage size in a virtual computer system based on information related to virtual machines, user inputs and/or configuration parameters

1. A computer program product embodied in a computer readable storage medium for optimizing virtual storage size in a virtual computer system comprising at least one virtual machine, each of said at least one virtual machine being allocated one or more virtual disks, the computer program product comprising the programming instructions for: determining a target set of virtual machines among said at least one virtual machine comprised in said virtual computer system based on information related to said at least one virtual machine and on shrinking constraints; for each virtual machine in said target set of virtual machines, identifying each virtual disk allocated to said virtual machine; and for each virtual disk allocated to said virtual machine, analyzing said virtual disk, estimating a virtual disk saving quantity based on the virtual disk analysis, generating a resized virtual disk based on the estimated virtual disk saving quantity, and replacing said virtual disk with said resized virtual disk.

2. The computer program product of claim 1 , wherein the programming instructions for determining said target set of virtual machines comprises the following programming instructions for each virtual machine in said virtual computer system and for each virtual disk in said each virtual machine: analyzing said virtual disk; and adding said virtual machine to said target set of virtual machines if a condition related to a state of at least one virtual disk allocated to said virtual machine is satisfied.

3. The computer program product of claim 2 further comprising the programming instructions for: marking said virtual disk satisfying said condition.

4. The computer program product of claim 1 , wherein the target set of virtual machines is identified by said shrinking constraints.

5. The computer program product of claim 1 , wherein the programming instructions for determining the target set of virtual machines comprises the following programming instructions for each virtual machine in the virtual computer system: adding the virtual machine to the target set if a condition related to a virtual machine state is satisfied.

6. The computer program product of claim 5 , wherein said condition comprises checking if a current virtual machine is in an active state.

7. A computer program product embodied in a computer readable storage medium for optimizing virtual storage size in a virtual computer system comprising at least one virtual machine, each of said at least one virtual machine being allocated one or more virtual disks, the computer program product comprising the programming instructions for: determining a target set of virtual machines among said at least one virtual machine comprised in said virtual computer system based on information related to said at least one virtual machine and on shrinking constraints; for each virtual machine in said target set of virtual machines, identifying each virtual disk allocated to said virtual machine; and for each virtual disk allocated to said virtual machine, analyzing said virtual disk, estimating a virtual disk saving quantity based on the virtual disk analysis, generating a resized virtual disk based on the estimated virtual disk saving quantity, and replacing said virtual disk with said resized virtual disk; wherein the programming instructions for determining said target set of virtual machines comprises the following programming instructions for each virtual machine in said virtual computer system and for each virtual disk in said each virtual machine: analyzing said virtual disk; and adding said virtual machine to said target set of virtual machines if a condition related to a state of at least one virtual disk allocated to said virtual machine is satisfied; wherein said condition comprises at least one of the following: checking if the disk saving quantity for the virtual disk is greater than a predefined threshold, checking if a frequency of disk size variations is lower than a predefined frequency threshold, checking whether the difference between a current virtual disk usage with respect to a host occupancy is greater than another predefined threshold.

8. A system, comprising: a memory unit for storing a computer program for optimizing virtual storage size in a virtual computer system comprising at least one virtual machine, each of said at least one virtual machine being allocated one or more virtual disks; and a processor coupled to said memory unit, wherein said processor, responsive to said computer program, comprises: circuitry for determining a target set of virtual machines among said at least one virtual machine comprised in said virtual computer system based on information related to said at least one virtual machine and on shrinking constraints; for each virtual machine in said target set of virtual machines, circuitry for identifying each virtual disk allocated to said virtual machine; and for each virtual disk allocated to said virtual machine, circuitry for analyzing said virtual disk, circuitry for estimating a virtual disk saving quantity based on the virtual disk analysis, circuitry for generating a resized virtual disk based on the estimated virtual disk saving quantity, and circuitry for replacing said virtual disk with said resized virtual disk.

9. The system of claim 8 , wherein the circuitry for determining said target set of virtual machines comprises for each virtual machine in said virtual computer system and for each virtual disk in said each virtual machine: circuitry for analyzing said virtual disk; and circuitry for adding said virtual machine to said target set of virtual machines if a condition related to a state of at least one virtual disk allocated to said virtual machine is satisfied.

10. The system of claim 9 , wherein said processor further comprises: circuitry for marking said virtual disk satisfying said condition.

11. The system of claim 8 , wherein the target set of virtual machines is identified by said shrinking constraints.

12. The system of claim 8 , wherein the circuitry for determining the target set of virtual machines comprises: for each virtual machine in the virtual computer system, circuitry for adding the virtual machine to the target set if a condition related to a virtual machine state is satisfied.

13. The system of claim 12 , wherein said condition comprises checking if a current virtual machine is in an active state.

14. A system, comprising: a memory unit for storing a computer program for optimizing virtual storage size in a virtual computer system comprising at least one virtual machine, each of said at least one virtual machine being allocated one or more virtual disks; and a processor coupled to said memory unit, wherein said processor, responsive to said computer program, comprises: circuitry for determining a target set of virtual machines among said at least one virtual machine comprised in said virtual computer system based on information related to said at least one virtual machine and on shrinking constraints; for each virtual machine in said target set of virtual machines, circuitry for identifying each virtual disk allocated to said virtual machine; and for each virtual disk allocated to said virtual machine, circuitry for analyzing said virtual disk, circuitry for estimating a virtual disk saving quantity based on the virtual disk analysis, circuitry for generating a resized virtual disk based on the estimated virtual disk saving quantity, and circuitry for replacing said virtual disk with said resized virtual disk; wherein the circuitry for determining said target set of virtual machines comprises for each virtual machine in said virtual computer system and for each virtual disk in said each virtual machine: circuitry for analyzing said virtual disk; and circuitry for adding said virtual machine to said target set of virtual machines if a condition related to a state of at least one virtual disk allocated to said virtual machine is satisfied; wherein said condition comprises at least one of the following: checking if the disk saving quantity for the virtual disk is greater than a predefined threshold, checking if a frequency of disk size variations is lower than a predefined frequency threshold, checking whether the difference between a current virtual disk usage with respect to a host occupancy is greater than another predefined threshold.